The reporting tool will almost certainly meet your needs best.
If you want more direct access, and have a good SQL developer and a safe environment to test queries, here's the v9 database structure:
https://docs.automic.com/documentation/webhelp/english/ALL/components/AE/9.13/DB%20Schema//db/_structure/HTML/index.htm. If you have any significant volume of history records, you're going to want to respect the indexes.
AH table is the main history, and doesn't change much between versions (web menu only goes back to v9, but it's probably similar enough to v8).
But again, I would stick with the reporting tool if possible.